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Old 5th May 2010, 10:16 AM   #1
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Default Priboj Reborn

I finish to rebuild a russian amplifier - Priboj (Priboi, Прибой).
In time i will translate all posts, but now with Google translate is possible to acces all messages (maybe the translation is not all time ok).
The steps are in next link: Google Traduce?i
Is described all stages to rebuild this russian amplifier.
I hope to help the owners of this amplifier.
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Old 7th May 2010, 09:15 AM   #2
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Please, for direct link use Google translate in a convenient language (english translation is relativelly ok).

After reading this link:
Forumul electronistilor • Vezi subiect - Reconditionare amplificator Priboi
I wanted a russian valve amplifier Priboj.
Finally i find one but damaged (around of 100$).
Another one have a relatively high price (400$ but tunned not to well).

The problems in my Priboj was:
- On power board supply bridge rectifier damaged, some resistors burned and broken capacitors
- On final boards few resistors burned, fuses replaced with wires, tubes consumed, connection wires missed
- one transfo out burned and distroyed by previsious owner
- Wires isolated unpropely
- "Cold soldering"
- Very, very dirty
- A lot of wires missed

The photos are here, with amplifier in initial status and schematics:
Picasa Web Albums - suzuki-san - priboj

Few schemes are here, where Priboj is modding:
Priboj

I buy the amplifier in February 20 then i begin to rebuild.

Now it look like this:
YouTube - Priboi amplifier reborn

In want to relate (in episodes) all steps which I followed up to became this valve amplifier functional, just as out of from factory.

I work alone becouse the prices to rebuid are high in a specialised service.
For my first project Forumul electronistilor • Vezi subiect - Amplificatorul meu cu 6P14P SE - o bijuterie!!! the proposed price was 200 euro, too much for me and i work most time alone.

I will continue ...
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Old 7th May 2010, 06:16 PM   #3
Olrum is offline Olrum  Ukraine
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Default Priboj new

This amp is a favorite with us for apgreyta.
Best thing you can do this move in triode mode, the sound will get good.No if left in the initial scheme, some changes are very needed.Not bad and the tubes 6p45s (el509) ...
Attached Images
File Type: png 001.png (47.8 KB, 454 views)
File Type: gif gu50se6e5p.GIF (9.4 KB, 443 views)
File Type: gif gu50sebp.GIF (7.2 KB, 435 views)
File Type: bmp 6p36spp.BMP (41.3 KB, 49 views)
File Type: gif gu50se2.GIF (9.2 KB, 432 views)
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Old 9th May 2010, 11:03 AM   #4
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Quote:
Originally Posted by Olrum View Post
This amp is a favorite with us for apgreyta.
Best thing you can do this move in triode mode, the sound will get good.No if left in the initial scheme, some changes are very needed.Not bad and the tubes 6p45s (el509) ...
I now this modifications and in future i want to change in pure class A, but now i describe the rebuild project. The trafo´s are to good and initial conception support a lot of mods.
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Old 9th May 2010, 11:07 AM   #5
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Episode 1:

After buy thea mplifier I go home with this. I check, summary, the problems and first off all I decide to clean all pieces.

So I proceed to dismantle in pieces and to cleaning up.
Picasa Web Albums - suzuki-san - priboj sapunirea

Plastic bottom plate is attached in the 6 screw. I open all screws from frafo for easy access in side.
Picasa Web Albums - suzuki-san - priboj sapunirea
I removed everything:
Picasa Web Albums - suzuki-san - priboj sapunirea
And then with all pieces in go in bathroom:
Picasa Web Albums - suzuki-san - priboj sapunirea
Picasa Web Albums - suzuki-san - priboj sapunirea
After cleaning I wait:
Picasa Web Albums - suzuki-san - priboj sapunirea
Picasa Web Albums - suzuki-san - priboj sapunirea
Picasa Web Albums - suzuki-san - priboj sapunirea
All pices reasambled together:
Picasa Web Albums - suzuki-san - priboj_faze2
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Old 9th May 2010, 09:34 PM   #6
kevinkr is offline kevinkr  United States
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I took a look, none of the links seem to work but I was able to see them by clicking on your photo link..

I noticed a lot of electrician's (black) tape holding wiring together which IMO is not a good thing - tie wraps are really indicated here or if you are feeling ambitious you can lace the wiring as was done in priboj originally.

The duct tape on the power transformer has to go, this is a FIRE hazard.

Glad it is working otherwise, amazing how different in some ways Soviet gear was from ours. The OPTs look pretty interesting..

I assume you reconfigured the OPTS for SE operation by regapping them and made the changes shown in the schematics or are you still using PP operation? The 100 ohm screen stoppers shown in the original design should probably be retained to prevent VHF oscillation.
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Last edited by kevinkr; 9th May 2010 at 09:39 PM.
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Old 10th May 2010, 12:02 AM   #7
Olrum is offline Olrum  Ukraine
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I do not see any sense to restore the initial circuit - she it is obsolete also lamps unreliable, and the sound is not so good. Better in my opinion being based on the given target transformers-2500/8 to apply other lamps More reliable - ГУ19, ГУ-18, ГУ-42 and ГУ-29...
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File Type: gif 29pp1.gif (49.0 KB, 351 views)
File Type: jpg 29pp.jpg (78.6 KB, 141 views)
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Old 10th May 2010, 09:37 AM   #8
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Quote:
Originally Posted by kevinkr View Post
I took a look, none of the links seem to work but I was able to see them by clicking on your photo link..
.
My mistake. Sorry!
The first pictures are here Picasa Web Albums - suzuki-san - priboj and cleaning process here Picasa Web Albums - suzuki-san - priboj sapunirea
Trafo out trouble Picasa Web Albums - suzuki-san - traf priboj

Later i will relate the continuation of rebuild process.
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Old 10th May 2010, 09:40 AM   #9
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Quote:
Originally Posted by Olrum View Post
I do not see any sense to restore the initial circuit - she it is obsolete also lamps unreliable, and the sound is not so good. Better in my opinion being based on the given target transformers-2500/8 to apply other lamps More reliable - ГУ19, ГУ-18, ГУ-42 and ГУ-29...
You have right. Now i work to a GU-19 project, based on Priboi ideea.
Anyway, almost based
I this case only i tried to "put on the road" a dead Priboi.
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Old 15th November 2013, 06:47 AM   #10
gsmok is offline gsmok  Poland
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I know the topic is old, but recently I had the opportunity to repair Priboj amplifier. Here I posted detailed photo report: Tube amplifier PRIBOJ.
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